Transactions of Materials and Heat Treatment

Title：Influence of pre-strain on properties and microstructure for high strength low alloy steel

Authors： Kong Yuqiang Li Wei Duan Peng

Unit： College of Mechanical Engineering Zhengzhou University of Science and Technology

KeyWords： high strength low alloy steel pre-strain mechanical properties work hardening microstructure

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2024,49(4):219-225

Abstract：

For HC340LA high strength low alloy steel, its microstructure and mechanical properties were analyzed, and 0%, 5%, 10% and 15% pre-strains were applied to the uniaxial tensile samples in three directions,respectively. Then, after unloading, the samples were subjected to secondary stretching until the fracture of samples, and the stress-strain curves were obtained. Furthermore, the key parameters such as mechanical properties and work hardening were extracted to obtain the influence laws of pre-strain, and the microstructure of uniform deformation zone was observed to obtain the influence of pre-strain on the microstructure. The results show that there is a yield platform and obvious Lüders band. The strength of material increases with the increasing of pre-strain. The elongation after fracture decreases at the pre-strain of 5%, but it increases with the continued in creasing of pre-strain. The instantaneous work hardening value rapidly decreases with the increasing of pre-strain, and there is a significant difference in variation amount. The size of ferrite grains changes with the increasing of pre-strain amount. The size of pearlite does not show significant changes, but its arrangement direction changes with the deformation of ferrite.

Funds：

河南省高等学校青年骨干教师培养计划资助项目(2023GGJS186);河南省高等学校重点科研项目（23B460010）

作者简介：孔玉强（1989-），男，硕士，讲师 E-mail：sxymtxy@163.com 通信作者：李伟（1983-），男，硕士，副教授 E-mail：249584256@qq.com

Reference：

[1]赵征志，陈伟健，高鹏飞，等.先进高强度汽车用钢研究进展及展望[J].钢铁研究学报，2020，32(12)：1059-1076.

Zhao Z Z, Chen W J, Gao P F, et al. Progress and perspective of advanced high strength automotive steel [J].Journal of Iron and Steel Research，2020，32(12)：1059-1076.

[2]Zhang X Y, Wang J L, Liu S Y,et al. Developing NiAlstrengthened HSLA steels by controlling nanoscale precipitation and highangle boundaries[J].Materials Science & Engineering A，2022，861: 144355.

[3]Wang F, Zheng X P, Long J . Effects of zirconium on the structure and mechanical properties of highstrength lowalloy steels under quenched or tempered conditions[J].Steel Research International, 2022,93(11):1-13.

[4]陈刚,罗小兵,柴锋,等.轧制加热温度对高强度低合金钢组织及冲击性能的影响[J].金属热处理,2022,47(4):116-121.

Chen G, Luo X B, Cai F, et al. Influence of rolling heating temperature on microstructure and impact property of a high strength low alloy steel [J]. Heat Treatment of Metals, 2022, 47(4):116-121.

[5]魏星，刘昱，张志建.深冲汽车车身用IF钢预应变拉伸实验[J].热加工工艺，2015，44(1)：109-111.

Wei X, Liu Y, Zhang Z J. Study on tensile test of deep drawing if steel with prestrain for automobile body[J].Hot Working Technology，2015，44(1)：109-111.

[6]余立,刘静,葛锐,等. DP780双相钢在不同应变状态下的断裂特性及机理[J]. 锻压技术,2022,47(10):48-55.

Yu L，Liu J，Ge R，et al. Fracture characteristics and mechanism on DP780 dualphase steel under different strain states[J]. Forging & Stamping Technology,2022,47(10):48-55.

[7]刘立现.预应变对高强钢DH780微观组织及力学性能的影响[J].热加工工艺,2022,51(7):97-101.

Liu L X. Effect of prestrain on microstructure and mechanical properties of high strength steel DH780 [J]. Hot Working Technology, 2022, 51(7):97-101.

[8]郝硕,李志国,张鑫, 等.预应变对TRIP型双相不锈钢拉伸变形行为的影响[J].钢铁,2022,57(4):105-113.

Hao S, Li Z G, Zhang X, et al. Influence of prestrain on tensile deformation behavior of TRIPassisted duplex stainless steel [J]. Iron and Steel, 2022, 57(4):105-113.

[9]邝春福.预应变与烘烤温度对低碳钢和双相钢组织性能的影响[J].钢铁钒钛,2020,41(4):150-156.

Kuang C F. Effects of prestrain and baking temperature on the microstructure and bakehardening behavior of mild steel and dual phase steel [J]. Iron Steel Vanadium Titanium, 2020, 41(4):150-156.

[10]GB/T 228.1—2021, 金属材料拉伸试验第1部分:室温试验方法[S].

GB/T 228.1—2021，Metallic materials—Tensile testing—Part 1: Method of test at room temperature test [S].

[11]胡汉江,赵爱民,印珠凯,等.预应变对TRIP钢力学性能及硬化行为的影响[J].材料热处理学报, 2016, 37(5):128-132.

Hu H J, Zhao A M, Yin Z K, et al. Effect of prestrain on mechanical properties and hardening behavior of TRIP steel [J]. Transactions of Materials and Heat Treatment, 2016, 37(5):128-132.

[12]刘坡,杨莉,孙晓寒, 等.预应变对H300LA低合金高强钢板冲压成形性能的影响[J].热加工工艺, 2019, 48(15):100-103，106.

Liu P, Yang L, Sun X H, et al. Effect of prestrain on stamping ability of H300LA HSLA steel sheet [J]. Hot Working Technology, 2019, 48(15):100-103，106.

[13]李凯尚,彭剑,彭健.预应变对奥氏体不锈钢力学行为的影响及本构模型的构建[J].材料工程,2018,46(11):148-154.

Li K S，Peng J, Peng J. Influence of prestrain on mechanical behavior of austenitic stainless steel and construction of constitutive models [J]. Journal of Materials Engineering, 2018, 46(11):148-154.

[14]Li Z,Misra R,Ding H,et al.The significant impact of prestrain on the structuremechanical properties relationship in coldrolled medium manganese TRIP steel[J].Materials Science & Engineering A, 2018, 712:206-213.

[15]李志红,任家宽,霍建生,等.冷轧低合金高强钢再结晶和析出行为研究[J].东北大学学报：自然科学版,2019,40(3):339-344.

Li Z H, Ren J K, Huo J S, et al. Study on recrystallization and precipitation behavior of coldrolled lowalloy high strength steel [J]. Journal of Northeastern University：Natural Science, 2019, 40(3):339-344.

Service：

【This site has not yet opened Download Service】【Add Favorite】